Fix: bug affecting sdsd feature #8
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This fixes a bug where sdsd variable will be reported inaccurately. It does so by removing the absolute value of the numeric derivative of the nn timeseries, to comply with definition of
sdsd: the standard deviation of successive differences. [^1, ^2]For reference, also look at
hrv-analysis.py: https://github.com/Aura-healthcare/hrv-analysis/blob/316b646a2422e453d85987a36ce144a702a98fe7/hrvanalysis/extract_features.py#L107C27-L107C28